Thesium resedoides A.W.Hill

Species

Angiosperms > Santalales > Santalaceae > Thesium

Characteristics

Rhizomatous suffrutex, 0.1-0.4 m tall, vegetative scales present on rhizome and lower parts of stems, stems 2 to 14(23), arising from rhizome at intervals, erect or suberect, compact, branched, sulcate to angular distally through decurrent leaves, terete below, brown to green, usually sparsely leafy, occasionally moderately leafy (5 to 12(18) leaves per 50 mm at middle of stem). Leaves spreading, often recurved, linear, 4.5-22.5(26.0) x 0.3-2.3 mm, apex acuminate and usually cartilaginous, midrib often raised on both surfaces, margins entire. Flowers usually solitary in bract axils, arranged in 5 to 16-flowered monotelic, racemose inflorescences sometimes accompanied by simple 3-flowered dichasial cymes, or very rarely 2 to 3-flowered monochasial cymes; pedicels (0.0)0.5-3.0 mm long, peduncles 0.5-7.0(22.0) mm long. Bracts linear-lanceolate, 2.0-9.0 x 0.2-1.0 mm, apex acuminate, margins entire, fused to entire pedicel/peduncle; bracteoles 1.7-6.5 x 0.2-0.4(1.0) mm. Perianth 2.5-3.3(5.0) mm long, elongate receptacle usually absent, 'glands' often visible on outside; lobes narrowly triangular, 1.1-1.5 x 0.4-0.9 mm, apex slightly hooded, with dense apical beard. Stamens inserted at base of tepals; filaments 0.2-0.4 mm long; anthers 0.4-0.7 mm long. Style 0.5-1.1 mm long, stigma ± opposite anthers. Placental column straight. Fruit sessile, 3.5-7.0 mm long including persistent perianth (2.5-5.0 mm long excluding perianth), 2.0-2.8 mm wide, with prominent reticulate venation.
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A herb or subshrub, perennial, forming low bushes; rootstock woody; stems erect, 6-8 in. high, bearing spreading branches 2-4 in. long, angled and grooved; leaves distant, spreading, 3-4 lin. long, subulate, acute, with colourless tips; inflorescences in simple or compound spikes or racemes; flowers either single and sessile in the axils of bracts or borne in short 3-flowered axillary cymes; bracts lanceolate, acute, equal in length to or half as long again as flower, sessile an axis or adnate to the peduncle; bracteoles springing from the bract-axil, shorter than the flower; perianth white, about 1 1/4 lin. long; segments elliptic-ovate, obtuse, 3/4 lin. long, apex hooded and with upper part of margin densely bearded; filaments 1/5 lin. long; anthers about 1/3 lin. long; style 3/8 lin. long; fruit ovoid, 1 1/2 lin. long, 1 lin. broad, immature, ribs obscure.
Stems branched from the base; branches ascending, slender, sharply angular or almost winged, sulcate between the angles, glabrous; leaves linear, very acute, 1/4-1/2 in. long, keeled below, flat or nearly so and prominently 1-nerved on the upper surface, glabrous; flowers solitary in the bract axil, subsessile; bract shortly adnate to the very short peduncle, longer than the flower, very similar to the leaves; bracteoles about as long as the flowers, narrowly linear, acute; perianth 1 1/3 lin. long; segments with conspicuous external glands, lanceolate, subacute, 3/4 lin. long, hooded, bearded at the apex; anther exserted from the perianth-tube, 1/4 lin. long; style 3/4-4/5 lin. long, reaching to the middle or top of the anthers; fruits elongate-ellipsoid, about 2 lin. long including the persistent perianth, with fairly conspicuous ribs and reticulation.
Perennial herb, dwarf shrub or shrub, 0.1-1.0 m high. Stems erect with spreading branches. Leaves distant, spreading, subulate, apex acute with colourless tips, recurved. Flowers: either single and sessile in axils of bracts or gathered in a terminal raceme-like inflorescence; bracts narrowly ovate, rounded on back, equal in length top or half as long as flower, sessile on axis or adnate to peduncle, margins entire, glabrous; perianth bearded, ± 2.65 mm long, segments elliptic-ovate, 1.6 mm long, apex hooded, upper part of margins densely bearded, white; Sep.-Feb. Fruit ovoid, ± 3 mm long, ribbed.
Perennial herb with a woody taproot up to c. 15 mm diameter at crown and woody stolons up to c. 10 mm in diameter; stems many tufted from the crown and at intervals along the stolons, 90–400 mm long, erect or ± sprawling, well branched from the base, shallowly ribbed by decurrent leaves and bracts, leafy.
Bracts (lowermost) 3.2–8 × 0.6–1.5 mm, linear to linear-lanceolate, markedly apiculate, adnate to the entire pedicel/peduncle, often strongly recurved, margins often very minutely scabridulous; bracteoles 2, 1.5–3.5 × 0.4–0.8 mm, resembling the bracts but only about half their length.
Leaves spreading or ascending, often up-or down-curved, c. 8–20(30) × 0.6–1.6 mm on middle part of stems, smaller upwards and passing into bracts, linear, apex tapered into a long acumen, margins pale, cartilaginous, often minutely scabridulous.
Flowers often solitary in the axils of the bracts, sometimes some in 3-flowered cymules, 6–17 racemosely arranged, terminal flowers the oldest, often in a 3-flowered cymule, the “racemes” further arranged in large much branched panicles.
Small, erect, much-branched herb, up to 200 mm tall. Leaves with recurved tips. Flowers usually in 3-flowered pedunculate cymules in bract axils arranged in racemes; white.
Herb, up to 300 mm tall. Leaves straight. Flowers usually in 3-flowered pedunculate cymules in axils of bracts, arranged in racemes. Flowers white.
Stamens inserted at base of perianth lobes; filaments 0.3–0.6 mm long, almost or quite hidden by anthers; anthers 0.5–0.8 mm long.
Slender herb, up to 450 mm tall. Leaves narrowly linear, curved. Perianth with external glands conspicuous. Flowers pale brown.
Perianth greenish outside; tube 0.7–1 mm long; lobes 1.3–1.7 × 0.7–1 mm, triangular, subacute, white-bearded from apex.
Herb, up to 160 mm tall, green not glaucous. Leaves 4-20 mm long, spreading or ascending. Flowers 76-127 mm a cymule.
Fruit 2.5(4) × 2.25–2.5(3.6) mm, light yellowish-brown, strongly ribbed and reticulate.
Style 0.6–1 mm long; stigma reaching top of tube.
Pedicels/peduncles 0–2(3) mm long.
Life form perennial
Growth form herb
Growth support parasite
Foliage retention evergreen
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.16 - 0.3
Root system rhizome tap-root
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months -
Fruit color
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Light -
Soil humidity 1-3
Soil texture 7-8
Soil acidity -
Soil nutriment -
Hardiness (USDA) 9-12

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Distribution

Thesium resedoides world distribution map, present in Angola, Botswana, Lesotho, eSwatini, and South Africa

Identifiers

LSID urn:lsid:ipni.org:names:781084-1
WFO ID wfo-0000455044
COL ID 56FN3
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Thesium resedoides Thesium burkei Thesium dumale Thesium junodii Thesium mossii